java Integer包装类的使用

package com.dxm.demo1;

public class Demo10 {

	public static void main(String[] args) {
		String[] arr={"10","20","30","40"};
		int sum=0;
		for (String s : arr) {
			int num=Integer.parseInt(s);
			sum+=num;
		}
		System.out.println(sum);
		
		int num=20;
		String hexString = Integer.toHexString(20);
		System.out.println(hexString);
		
		String binaryString = Integer.toBinaryString(num);
		System.out.println(binaryString);
		
		System.out.println(Integer.MAX_VALUE);
		
		System.out.println(Integer.MIN_VALUE);
		
		System.out.println(Integer.SIZE);
		
		
	}

}